一个十边形的每个内角都相等，则每个内角的度数为（                 ）

    The Spring Festival begins on the first day of the f____ month of the Chinese calendar(日历) while the Western New Year starts on the first day of J____．Before the Spring Festival comes，everyone b____busy．They clean their houses，cook a lot of d____food and go s____for presents．

    On the eve (前夕) of the Chinese New Year, every family member stays home for d____and welcomes the New Year with hope and happiness．They w____ the Spring Festival Evening Party by CCTV and go to bed very late．The children get “lucky money” f____ the older．With the m____ they can buy books, toys, food and many other t____．(完)

沙漠中植被的出现可对沙丘产生一定的影响。其主要作用机制是（   ）